Coal-cutting machine



2 Sheets-Sheet 1.

(No Model.)

J. G. ROBERTSON. GOAL CUTTING MAGEINE.

Patented Aug. 27, 1889.

Q Vi IM as me a N. PETERS. Pholo-Llihographnr, Washington, Dv C.

UNITED STATES PATENT OFFICE.

JAMES C. ROBERTSON, OF MORRISDALE MINES, ASSIGNOR OF ONE-HALF TO ALEXANDER IIOOD, OF PHILIPSBURG, PENNSYLVANIA.

COAL-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent Ive-109,870, dated August 27, 1889.

Application filed August 28, 1888. Serial No. 283,952. (No model.)

To all whom it may concern: allel with the feed-screws E, and are journaled Be it known that I, JAMES C. ROBERTSON, at their ends in the end plates A and A. The a citizen of the United States, residing at Morends of the feed-screws E E project beyond risdale Mines, in the county of Olearfield and the end plate A, and are provided with State of Pennsylvania, have invented new and sprocket-wheels e e, which are connected with useful Improvements in Coal-Cutting Mathe double sprocket-wheel J by the sprocketchines, of which the following is a speoiticachains 6' c. The ends of the worm-threaded tion. rods I I extend beyond the same plate A, and This invention relates to coal-cutting mahave pinions 'L' on the said extended ends [0 chines, and has for its object the provision of which mesh with the master-wheel K. The -:o a machine that will be capable of cutting into double sprocket-wheel J and the master gearthe bed of the coal any desired depth and wheel K are cast together; or, if made sepalength, the mining-tool being rotated and adrate, are secured together in any suitable manvanced to its work at the same time by mener, and are journaled on the same stud 7t.

[5 chanioal appliances which receive their mo- It is intended to have the several sprockettion from a single master-wheel. wheels, pinions, and master gear-wheel made The improvement consists of the novel fearemovable, so they may be replaced by others tures,which hereinafter will be more particuof a different size in order to vary the speed larly described and claimed. I of the feed-screws and the worm-threaded .20 In the drawings, Figure l is a perspective rods. 7 view of a machine embodying my invention. The end plates have slots Z, extending from Fig. 2 is a cross-section on the line 00 0c of Fig. the bearin gs of the feed-screws through the 1. Fig. 3 is a detail section on the line 11 y edge of the said plates, to permit the ready of Fig. 2. Fig. is an end view, showing the removal of the said feed-screws. These slots 2 5 gearing. Fig. 5 is a horizontal section of one are closed by blocks L, which have flanges end of the machine on the line 2 z of Fig. 4:. overlapping the plate on each side of the slot Fig. 0 is a detail view of a saw-blade. Fig. '7 and screwed to the said plate by suitable is an end View of the mining tool or saw. fastening devices passing through the said The frame is composed of the end plates A flanges. The carriage D also has slots m, to

0 and A, the longitudinal rods or bolt-s B B, admit of its being removed from the said feedand the bottom bars C O. The carriage D, screws. These slots m are closed by blocks mounted on the bars 0 O, and free to slide on M, which are constructed like the blocks L. said bars from one end plate to the other, is The miningtool consists of the arbor N controlled in its movementsbythe feedscrews and the blades 0, having their outer edges 3 5 E E, which have bearings at their ends in the serrated and their inner edges provided with end plates A and A, and which pass through arms 71, which extend through transverse threaded sleeves Fin the said carriage. These openings in the arbor. These arms a are sleeves have a flange at one end and are made threaded on their outer ends and have nuts in halves, and are externallythreaded to screw 77. screwed thereon to hold the blades to the 0 in corresponding threaded openings in the said arbor. The blades are disposed around said carriage. The set screws f, passing the arbor, and are arranged to have the teeth through the carriage and bearing on the of one blade to come opposite the space besleeves, hold them in position. The carriage tween the teeth of the adjacent blades, so is provided with standards D, which form that the tool in one complete revolution will 45 bearings for the shaft G. The outer end of act on every particle of coal within its path. this shaft is adapted to receive a suitable The end plates are provided with eyes P at inining-tool, and for this purpose is provided each end, through which the standards Q with the chuck g. The worm-wheels H 11, pass, the frame being held adjustably on the keyed to the shaft G, mesh with correspondstandards by the set screws 1), which pass 50 ing worm-threaded rods I, which extend parthrough the said eyes P. The upper ends of I the standards are brought together to form the stem (1', which is threaded and receives the turn-buckle R, which is mounted thereon. The upper end of this turn-buckle terminates in the center r.

The frame may be of any desired length, and is supported solely on the standardsQ. These standards rest on the bottom of the shaft and are held at their upper ends by the turnbuekles R, which have their pointed ends forced into the roof of the said shaft. By rotating the turn-buckle on the threaded stem q, its end 0" may be forced in or withdrawn from the bed of coal, according to the direction in which it is rotated and as may be required to steady or loosen the said standards. Before applying the machine a hole must be drilled in the bed of coal the required size and depth. To adjust the machine, the mining-tool secured to the shaft G is inserted in the hole in the stratum of coal, the carriage being at one end of the frame, motion being imparted to the master Wheel by suitable power. The crank S, being provided for the purpose, communicates its motion to the feedserews E E and the Worm-threaded rods I I, through the instrumentalities hereinbefore described, and rotates the shaft G and advances the carriage D, carrying the tool to its Work. hen the carriage has reached the other end of the frame, it can be quickly returned to its normal position by loosening the setscrews f and unscrewing the sleeves F and pushing it along on the bars 0, the

- feed-screws passing freely through the openings from which the sleeves F have been removed.

Having thus described my invention, I claim 1. The combination of the end plates A A,

- the longitudinal rods connecting the same,

the rods B and bars 0, connecting the said plates, the carriage supported transversely on the bars C, the wornrshafts journaled in the end plates and extending over the earriagc, the cutter-shaft mounted on the earriage, and mechanism for simultaneously ro-' the carriage on the bars (I, as set forth.

4. The combination of the end platesA A, the rods l5 and bars 0, connecting said end plates, the feed-screws journaled in the end plates, the carriage mounted transversely on the bars 0 and having its ends engaging the feed-screws, the worm-shafts journaled in the end plates above the carriage, the cutter-shaft mounted on the carriage and provided with worm-wheels el'lgaging the worm-shafts, and mechanism for simultaneously rotating the feed-screws and the worm-shafts, as set forth.

5. In a n'lininganachine, the combination, with the frame, the carriage, and the feedscrew, of the sleeve internally threaded to fit the feed-screw, made in the two halves and externally threaded and screwed in the said carriage, and the set-screw for holding the sleeve in place, substantially as described.

6. The combination, with the arbor having diametrical openings, of the blades 0, each having a series of arms n, passing through said openings and provided with screwthreaded extremities, and the nuts 02, mounted on said extremities and adapted to be turned up against the arbor, as set forth.

In testimony thatI claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

JAMES C. ROBERTSON.

Witnesses:

WM. E. IRWIN, JEssIE SCOTT. 

